Abstract: Vehicle power device supplies storage battery with charging power from power conversion circuit to charge it with connector attached to inlet of electric vehicle. Stress detector detects force exerted on junction by tensile strength of electric cable. Controller is configured: to start an output operation of charging power through power conversion circuit if the detected force is below a first threshold (K1); to raise an alarm through display and sound output device if the detected force is the first threshold (K1) or more when power conversion circuit outputs the charging power; and to stop power conversion circuit outputting the charging power if the detected force is a second threshold (K2) or more when power conversion circuit outputs the charging power, where K2>K1.

Abstract: A power distribution system includes a DC-DC converter which outputs a DC power after converting the DC power outputted from a DC power source to a desired voltage level. In the power distribution system, the DC-DC converter is controlled so as to operate only when the input voltage falls in a predetermined range.

Abstract: A DC/DC converter has DC input terminals to which a DC power is inputted, a transformer, and a bidirectional switching device on the primary side of the transformer.

Abstract: A power supply device includes a transformer; a series circuit of two bidirectional switching elements connected between terminals of the commercial power supply and having a rectification function and a switching function; an LC resonant circuit connected between a primary coil of the transformer and both ends of one of the bidirectional switching elements; a rectifying element connected to a secondary coil of the transformer; and a control circuit for inputting a gate driving signal to the bidirectional switching elements. The power supply device performs synchronous rectification from the bidirectional switching elements.

Abstract: A power supply device includes a fuel-cell power device which supplies a direct current (DC) power to one or more load devices using fuel cells as an input source; and a control unit which controls an output from the fuel-cell power device. In the power supply device, when a load current supplied to the load device is changed, an output characteristic of the fuel-cell power device is shifted so that a rate of change in an output current of the fuel-cell power device becomes lower than a preset value. With the power supply device, even though the fuel-cell is used as a power source, a DC power supplied to the load devices can be gradually changed and therefore reduce environmental load.

Abstract: The power supply apparatus includes a first power device, a second power unit, and controlling means. Each of the first power device and the second power unit supplies DC power to a DC supply line. The first power device makes constant voltage control. The second power unit includes a second power device configured to make inclination control of monotonically decreasing its output voltage with an increase of its output current, and of monotonically increasing its output voltage with a decrease of its output current. Upon acknowledging that a measurement (a magnitude of a current flowing through the DC supply line) exceeds an optimal current magnitude (a magnitude of a current supplied to the DC supply line from the first power device operating at maximum conversion efficiency), the controlling means outputs an instruction such that a magnitude of a current supplied to the DC supply line from the second power unit is identical to a difference between the measurement and the optimal current magnitude.

Abstract: A power distribution system for distributing an electric power charged in a battery to a plurality of dwelling units includes a power generation device which has a independent power generation function and is configured to generate an electric power and charge the battery with at least a part of the electric power thus generated, a first control device having a residual amount measuring unit for measuring a residual amount of the electric power charged in the battery and a plurality of second control devices which are provided in a corresponding relationship with the dwelling units and make communications with the first control device. The first control device is configured to adjust an amount of the electric power supplied from the battery to the dwelling units based on a measurement result of the residual amount measuring unit and information received from each of the second control devices.

Abstract: A DC distribution board comprises, therein as internal devices, a circuit breaker 5 provided along each of branch lines branched from main wires of a direct-current power supply, and a controller 6 for controlling switching of the breaker 5. The circuit breaker 5 comprises: power connecting terminals t1, t2 connected to the main wires; load connecting terminals t3, t4 connected with wires from a load; a semiconductor switch device 57 provided along an electrical circuit between the terminals t1, t2 and the terminals t3, t4; a current sensing resistor 56 for detecting an electric current through the electrical circuit; and a arithmetic circuit 60 for turning the device 57 on or off according to an on/off control signal from the controller 6, and coercively turning the device 57 off when a current value obtained from a voltage across the resistor 56 exceeds a set current.

Abstract: The power supply apparatus a main power device, an auxiliary power unit, and controlling means. Each of the main power device and the auxiliary power unit is configured to supply DC power to a DC supply line. The main power device is configured to generate DC power by use of power supplied from a secondary cell. The controlling means is configured to, when a measurement (a magnitude of a current flowing through the DC supply line) exceeds an optimal current magnitude, send an instruction to the main power device such that a current supplied from the main power device to the DC supply line has the same magnitude as the optimal current magnitude.

Abstract: The electric-vehicular charge and discharge device of the present invention includes a power converter, a grounding unit, a ground fault detector, and a switcher. The power converter is interposed between an external circuit and a pair of power terminals of a secondary battery unit of an electric vehicle, and is configured to convert power between the external circuit and the secondary battery unit. The grounding unit connects at least one of the pair of power terminals of the secondary battery unit to a grounding point to be connected to the power converter. The ground fault detector determines whether a ground fault has occurred in a power supply path between the power converter and the secondary battery unit. The switcher separates the secondary battery unit from the power supply path when the ground fault detector determines that a ground fault has occurred in the power supply path.

Abstract: Disclosed is a bidirectional DC/DC converter including: a primary side circuit that includes a first DC power source or a first load; a secondary side circuit that includes a second load or a second DC power source; and a power transfer unit that is capable of transferring power bi-directionally between the primary side circuit and the secondary side circuit. Further, the bidirectional DC/DC converter includes a control circuit that controls the primary side circuit and secondary side circuit in such a way that current flows through the power transfer unit from the first DC power source to the second load or from the second DC power source to the first load.

Abstract: A DC/DC converter has DC input terminals to which a DC power is inputted, a transformer, and a bidirectional switching device on the primary side of the transformer.

Abstract: Disclosed is a bidirectional DC/DC converter including: a primary side circuit that includes a first DC power source or a first load; a secondary side circuit that includes a second load or a second DC power source; and a power transfer unit that is capable of transferring power bi-directionally between the primary side circuit and the secondary side circuit. Further, the bidirectional DC/DC converter includes a control circuit that controls the primary side circuit and secondary side circuit in such a way that current flows through the power transfer unit from the first DC power source to the second load or from the second DC power source to the first load.

Abstract: The DC switch includes a housing (2) provided with a power connection terminal (2a) adapted in use to be connected to a power source, and a load connection terminal (2b) adapted in use to be connected to a load. A contact unit (1) is interposed between the power connection terminal (2a) and the load connection terminal (2b). The contact unit (1) has mechanical contacts (10), and a semiconductor switch (11) serially connected to the mechanical contacts (10). The DC switch further includes a switching mechanism unit (3) having an operating handle (30) used for manual operation and movably attached to the housing (2), a position detection unit (4) configured to detect an operating position of the operating handle (30), and a control unit (7). The switching mechanism unit (3) is configured to open and close the mechanical contacts (10) in response to the manual operation of the operating handle (30).

Abstract: A charging monitor has a switch disposed between a load section having a storage battery and an external AC power supply supplying a current to the load section via a plurality of lines and interrupts the supply of the current from the external AC power supply to the load section; a current detection circuit; a suppression circuit that suppresses a DC component contained in the detection signal; a filter circuit that filters a plurality of frequency components contained in the detection signal so that attenuation increases as a frequency becomes high; a rectifier smoothing circuit that rectifies and smoothens an output signal; and an electric leakage determination circuit that detects an electric leakage and shuts off the switch.

Abstract: A power distribution system for a building includes an electric current sensor for detecting a value of a current flowing from a commercial AC power source through a main line in a building and a storage battery installed in the building. When the current value detected by the electric current sensor reaches a predetermined value, a supply of an electric power to the building from the storage battery is initiated. The power distribution system further includes an overcurrent protection unit. The building includes sections individually equipped with electric power supply systems, and the overcurrent protection unit protects the main line of the building from an overcurrent by initiating the supply of the electric power from the storage battery to the building when the current value detected by the electric current sensor becomes equal to or greater than a predetermined current value for the initiation of main line protection.

Abstract: A DC power distribution system is equipped with a storage device having a first storage battery, which discharges to electrical apparatuses only during power failure, and a second storage battery, which discharges to electrical apparatuses when service is not interrupted. The electricity storage device and electrical apparatuses are supplied with DC power from a power generation device which generates electricity using natural energy, and DC power which has been converted from AC power supplied from a commercial power source. When the power supply from the electricity generation device and the commercial power source is interrupted, the first storage battery discharges power to the electrical apparatuses.

Abstract: A power distribution system for distributing an electric power charged in a battery to a plurality of dwelling units includes a power generation device which has a independent power generation function and is configured to generate an electric power and charge the battery with at least a part of the electric power thus generated, a first control device having a residual amount measuring unit for measuring a residual amount of the electric power charged in the battery and a plurality of second control devices which are provided in a corresponding relationship with the dwelling units and make communications with the first control device. The first control device is configured to adjust an amount of the electric power supplied from the battery to the dwelling units based on a measurement result of the residual amount measuring unit and information received from each of the second control devices.

Abstract: A power distribution system distributes power to each section of a building via a main line which is wired to pass through each section of the building. The power distribution system is equipped with a plurality of sensors which are provided at each section of the building and which monitor the current value of the main line in the respective sections.

Abstract: In a power interchange system, an electric power generated by a power generation device is interchanged between power consuming dwellings in a multi-family house. Each power consuming dwelling generates the power by using the power generation device and receives a commercial AC power supply via a shared power supply wiring. The amount of electric power supplied to each power consuming dwelling is managed by a power management device. The power management device manages a surplus power amount of one power consuming dwelling and a required electric power amount of another power consuming dwelling and supplies the surplus power from the former power consuming dwelling to the latter power consuming dwelling via the power supply wiring.